. >>> chris matthews is up next. >>> tonight we bring to you my interview with president obama. i have covered two great world events in my career. one was the fall of the berlin wall in 1989. the other was the first democratic election in south africa five years later. i was there when the country's black majority voted by the millions, waiting in lines that stretched from one horizon to the other. i saw first hand the devotion to democracy. it was the great legacy of the man who died today. president obama paid tribute to nelson mandela today.